This is an ABI change on platforms where sizeof(time_t) doesn't equal
sizeof(long). For most platforms this change shouldn't make a difference
at present. OpenBSD recently switched to 64bit time_t on all architectures
to avoid time_t overflow in 2038 on 32bit machines.
This fix extends to consumers of startup-notification, for instance
the window manager of XFCE, which is how I got involved in this.
See http://mail.xfce.org/pipermail/xfce4-dev/2014-February/030611.html
and follow-ups. The XFCE devs pointed out that my patch to fix a
crash in XFCE's window manager depends on this startup-notification patch.
Signed-off-by: Julien Danjou <julien@danjou.info>